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“Invent a New India Using Knowledge”

है”ह”ह

IS 10149 (1982): Positive list of constituent of styrenepolymers in contact with foodstuffs, pharmaceuticals anddrinking water [PCD 12: Plastics]

IS : 10149 - 1982

Indian Standard POSITIVE LIST OF

CONSTITUENTS OF STYRENE POLYMERS IN CONTACT WITH FOODSTUFFS,

PHARMACEUTICALS AND DRINKING WATER

Plastics Sectional Committee, PCDC 12

Chairman

DR K. J. BALAKRISHNA A-10, Shantinagar, Cantonment, Kanpur

Members Representing

DR P. C. ANTONY Indian Plastics Ltd, Bombay SHRI N. L. BIRLA ( Alternuts )

SHRI A. S. ATHALYE All India Plastics Manufacturers’ Association, Bombay

SECRETARY ( AIPMA ) ( Alternate ) DR P. K. BANERJEE Polyolcfins Industries Ltd, Bombay SHRI A. T. BASAK Directorate General of Supplies and Disposals,

New Delhi SHRI B. B. RAI ( Alternate )

SRRI K. J. BHATT State Trading Corporation of India Ltd, New Delhi

SHRI BHA~WAN DASWANI ( Alternate j ’ SHRI S. T. BHOJWANI

SHRI A. FI. KHAN ( Alternate ) Bright Brothers Ltd, Bombay

SHRI T. S. BIDDAPA National Organic Chemical Industries Ltd,

SHRI J. K. VADODARIA ( Alternate ) Bombay -

DR R. P. DAMBAL Indian Telephone Industries Ltd, Bangalore SHRI G. V. RAO (Alternatc )

DR S. P. SIN~H DHAKAREY Ministry of Defence (DGI) SHRI N. C. BOSE ( Alternate )

SHRI 0. P. DHAMIJA Export Inspection Council of India, Calcutta SHRI M. K. UNNIKRISHNAN ( Alternate )

SHRI DION FERNAWDES Plastics h Linoleum Export Promotion Courpcil, Bombay

SHRI K. RAMANI ( Alternate )

( Continued on pugs 2 )

0 Co/pvrght 1982

INDIAN STANDARDS INSTITUTION

This publication is protected under the Zndiun Coprright Act (XIV of 1957) and reproduction in whole or in part by any means except with written permission of th publisher shall be deemed to be an infringement of copyright under the said Act

.

IS :10149 -1982

( Continued from pate 1)

Members Reprsscntin~

SHBI M. S. FRANOIS Central Institute of Plastics Engineering and Tools, Madras

SHRI CHANDRAKANT B. GARWARE SH~I H. S. SURI ( A~tcrftatc )

SHRI A. GFIO~H SHRI S. M. LAHIRI ( A&crnutc )

Garware Synthetics Pvt Ltd, Bombay

National Test House, Calcutta

Hoechst Dyes 8s Chemicala Ltd, Bombay SHRI S. K. JAIN SERI K. A. T. VARQRESE ( AIttrnatr )

DR S. P. MANIX Railway Board ( Ministry of Railways ) SIIRI N. KRISRNANPPA ( Altcrnatc )

SHRI P. R. MAHALINQAM Chemicals & Plastics ( India ) Ltd, Madras Saav S. S. GATTANI ( Altrrnatr)

Saar P. R. MALEAN Development Commissioner, Small Scale Indus- tries, New Delhi

SHRI S. R. Sr~aa ( Alternate ) SERI R. C. MISHRA Bharat Heavy Electricals Ltd, Bhopal

SBBI G. L. ANAND ( Altsrnate ) SERI A. K. BAS~J ( Alternate )

SERI S. MITRA Calicgoo~~;;icals ( Plastics and Fibres Division),

DR B. R. C. ANAND ( Alternafr ) SERI K. R. NARASIXHAN Metal Box Ltd, Calcutta

DR S. LAXSEYANAN ( Alternate ) SHRI V. NIJEAWAN Union Carbide India Ltd, Calcutta

SHRI A. K. GTJPTA ( Alternate ) SHBI M. S. RAMAMURTHI Polychem Limited, Bombay

SHRI C. U. KHANDHERIA ( Altsrnate ) SHRI 0. P. RAXXA National Buildings Organization, New Delhi

SBRI D. A. Rsms Kosmek Plastics Manufacturing Ltd, Bombay SHRI 0. P. BANE~JEE ( Altrrnatr )

SERI R. SAXTIZANA~ The Alkali & Chemical Corporation of India Limited, Calcutta

SERI D. JAIN ( Altsrnatr ) DR P. R. SESHAN Indian Petrochemicals Corporation Ltd,

Vadodara SHRI A. K. RAY ( Alternatr )

SHRI P. P. SHARMA . Directorate General of Technical Development, New Delhi

SERI N. K. A~ARWAL (Alternate) DR J. VAID Peico Electronics Et Electricals Ltd, Pune

DR S. P. BHIDE ( Altcrnatr ) DR S. P. VOHBA Bakelite Hylam Ltd, Hyderabad

SHRI Y. V. CHITTAL (Alternate ) SHRI M. S. SAXENA, Director General, IS1 ( Ex-o&i0 Msmbrr )

Director ( P&C ) ( Secretary )

( Continued aa pag# 13 )

2

IS :10149 - 1982

Indian Standard POSITIVE LIST OF

CONSTITUENTS OF STYRENE POLYMERS IN CONTACT WITH FOODSTUFFS,

PHARMACEUTICALS AND DRINKING WATER

0. FOREWORD

0.1 This Indian Standard was adopted by the Indian Standards Institution on 13 May 1982, after the draft finalized by the Plastics Sectional Committee had been approved by the Petroleum, Coal and Related Products Division Council.

0.2 Plastics are now being used on a large scale for packaging of foodstuffs and pharmaceuticals. Where direct contact occurs between the packed commodity and the plastics, the high-molecular-mass polymer itself does not pose a toxic hazard being inert and essentially insoluble in food. There is, however, a likelihood that some transfer will occur of polymer additives, adventitious impurities, such as monomers, catalyst remnants and residual polymerisation solvents and of low molecular mass polymer fractions from the plastics into the packaged material with consequent toxic hazard to the consumers. The occurrence of acute toxicity due to plastics materials in contact with food is most unlikely, since only trace quantities of potentially toxic materials are likely to migrate. However, the accumulation of these toxic materials with time may lead to hazards which may be serious.

0.3 Initially the Sectional Committee responsible for the preparation of this standard had prepared three codes of practice for safe use of polyvinyl chloride ( IS: 7288-1974” ), polyethylene ( IS : 7277-1974t ) and styrene polymers ( IS : 7961-1976: ) in contact with foodstuffs, pharmaceuticals and drinking water. Taking cognizance of the pressing need to monitor the quality of plastics intended to come in contact with foodstuffs, pharmaceuticals and drinking water which could not be done on the basis of standard codes of practice, the Committee decided to

*Code of practice for safe use of polyvinyl chloride (PVC) and its copolymers in contact with foodstuffs, pharmaceuticals and drinking water.

tCode of practice for safe use of polyethylene in contact with foodstuffs, pharmaceu- tical and drinking water.

JCode of practice for safe use of styrene polymers in contact with foodstuffs, pharmaceuticals and drinking water.

3

IS :10149 - 1982

prepare the following series of Indian Standards dealing with various aspects of plastics for food contact applications:

IS : 9833-1981 List of pigments and colourants for use in plastics in contact with foodstuffs, pharmaceuticals and drinking water;

IS : 9845-1981 Method of analysis for the determination of specific and/or overall migration of constituents of plastics materials and articles intended to come into contact with foodstuffs;

IS : 10 14 l- 1982 Positive list of constituents of polyethylene in contact with foodstuffs, pharmaceuticals and drinking water;

IS : 10142-1982 Specification for styrene polymers for its safe use in contact with foodstuffs, pharmaceuticals and drinking water;

IS: 10146-1982 Specification for polyethylene for its safe use in contact with foodstuffs, pharmaceuticals and drinking water;

IS: 10148-1982 Positive list of constituents of polyvinyl chloride (PVC) and its copolymers in contact with food- stuffs, pharmaceuticals and drinking water;

IS : 10149-1982 Positive list of constituents of styrene polymers in contact with foodstuffs, pharmaceuticals and drinking water;

IS : 10151-1982 Specification for polyvinyl chloride ( PVC ) and its copolymers for its safe use in contact with food- stuffs, pharmaceuticals and drinking water; and

IS : 10171-1982 Guide on suitability of plastics for food packaging.

Eventually the three codes of practice would be withdrawn with the publication of the product specification along with the corresponding positive list for the three plastics. Standards for other plastics for food contact applications like polypropylene and unsaturated polyester resins which are under preparation are expected to follow the same pattern, namely, a product specification with a corresponding positive list. It is hoped that this set of Indian Standards for plastics considered safe for food contact applications would help the statutory bodies to effectively monitor the quality of plastics for this end use.

4

IS : 10149 - 1982 ~

0.4 This list of additives prescribed in these positive lists are based on the ‘information available through published literature like British Plastics Federation Reports, London (English); FDA Regulations, USA; and other national legislation reports.

1. SCOPE

1.1 This standard covers positive list of constituents of styrene polymers, namely, the polymers, residual monomers, catalysts, emulsifying agents, suspension agents, miscellaneous polymerization additives like process oxidants, and chain transfer agents, polymerization ingredients and auxiliary items for working which may be regarded as safe for use, when properly processed, in contact with foodstuffs, pharmaceuticals and drinking water and when present in the prescribed limits of concentration.

1.2 The positive list does not purport to establish the suitability of the ingredient singly in a particular foodstuff from other than toxicological considerations.

2. TERMINOLOGY

2.1 Styrene polymers shall mean:

4 b)

Homopolymers of styrene;

Copolymers of styrene with one or more of the following monomers. The copolymers shall contain at least 50 percent by mass of styrene or substituted styrene ( styrene substituted in the benzene ring or the vinyl group by halogens or alkyd groups ):

1) 2) 3)

4)

5)

6)

7)

8)

9)

10)

Acrylonitrile;

Acrylic, fumaric, itaconic, maleic or methacrylic acid;

Esters of the acids given in 2.1(b)(2) above with saturated monohydric aliphatic alcohols ( C, to C, );

Vinyl esters of monobasic aliphatic acids;

Butadiene;

Divinyl benzene;

Ethylene, propylene, butene or isobutene;

Vinyl esters of saturated monohydric aliphatic alcohols;

N-vinyl carbazole; and

Acenaphthalene

5

IS :10149 - 1982

c) Mixtures of the products listed in 2.1(a) and 2.1(b); and

d) Mixtures of the products listed in 2.1(a) and 2.1(b) with one or more of the following to any level of not more than 50 percent of the finished polymer. The term ‘mixture’ in this context refers solely to the two phase nature of the final composition and not to the method of its manufacture:

1) Polybutadiene;

2) Butadiene copolymer rubbers ( for example, copolymers with styrene, acrylonitrile, ethylene or isoprene );

3) Polyisoprene;

4) Ethylene/propylene copolymer rubbers;

5) Ethylene/propylene/non-conjugated diene terpolymer rubber;

6) Homo or copolymer rubbers of acrylic acid esters with monohydric saturated aliphatic alcohols;

7) Ethylene-vinyl acetate copolymer rubbers; and

8) Isobutene/isoprene copolymer rubbers.

3. REQUREMENTS

3.1 Basic Resin - To comply with this standard, the styrene polymers defined in 2.1 shall be made in such a way that they contain no ingredients or residues of ingredients other than those listed in the follow;ng clauses.

3.2 Residual Monomers - The total residual monomers, when present, shall not exceed 0.2 percent by mass of the polymer when tested according to the method prescribed in IS : 10142-1982”.

3.3 Catalyst - The total residue of catalyst and their decomposition products unbound to polymer shall constitute less than 0.2 percent by mass of the plymer polymer. The residue of the following catalysts may be present:

a) Benzoyl peroxide;

b) Aliphatic acid peroxides ( C, to C,, );

c) tert-Butyl perbenzoate;

d) Cumene hydroperoxide;

*Specification for styrene polymers for its safe use in contact with foodstuffs, pharmaceuticals and drinking water.

6

IS:10149 -1982

e) tert-Butyl hydroperoxide;

f ) Dicumyl peroxide;

g) Di-tert-butyl peroxide;

h) terf-butyl peroxy diethyl acetate;

j ) Azo-bis-isobutyronitrile;

k) Potassium persulphate;

m) tcrt-Butyl peracetate;

n) 2, 2-Bis-( tert-butyl peroxy ) butane;

p) 2, P-Bis-( tert-butyl peroxy ) hexane; and

q) Azo-bis-cyclohexanyl carbonitrile.

3.4 Emulsifying Agents - The total emulsifying agents shall constitute less than 0.2 percent by mass of the finished polymer. The residue of the following emulsifying agents may be present:

a) Alkyl and alkylarylsulphates of sodium, potassium and ammonium, the alkyl group containing Cl,, to C,,;

b) Alkyl and alkylaryl sulphonates of sodium, potassium and ammonium , the alkyl group containing Cl, to C,,;

c) Products of condensation of ethylene oxide and mono aliphatic acids ( CQ, to C,, ) and their sodium and ammonium sulphates;

d) Products of condensation of ethylene oxide and mono aliphatfc acid alcohols ( Cl,, to C,, ) and their sodium and ammonium sulphates;

e) Products of condensation of ethylene oxide with phenols having alkyl groups C, and above and their sodium and ammonium sulphates;

f ) Polyethylene glycol ( molecular mass at least 300, free of ethylene glycol and diethylene glycol );

g) Polyethylene glycol mono-oleate;

h) Sodium stearate \ and the corresponding acid ); and

j) Sodium salt of naphthalene sulphonic acid/formaldehyde condensate.

7

IS : 10149 - 1982

3.5 Suspension Agents - The total residue of suspension agents shall constitute less than 0.2 percent by mass of the finished polymer. The residue of the following suspension agents may be present:

a) Polyvinyl alcohol ( having a viscosity of at least 4 centipoise at 20°C in 4 percent aqueous solution ),

b) Calcium and sodium phosphates,

C) Phosphoric acids,

d) Calcium chloride,

e) Dicalcium hydrogen phosphate,

f) Tricalcium phosphate,

g) Potassium chloride,

h) Sodium chloride,

3 Acetic acid,

k) Sodium acetate,

ml Bentonite,

4 Gelatine,

P) Poly-N-vinyl pyrrolidone,

9) Polyacrylic acids and their sodium salts,

r) Hydroxyethyl cellulose,

s) Sodium nonyl phosphate,

t) Sodium dioctyl sulpho-succinate,

u) Magnesium sulphate, and

v) Sodium sulphate.

3.6 Miscellaneous Polymerization Additives - The total residues, unbound to the polymer, of inhibitors, process antioxidants and chain transfer agents shall constitute less than 0.4 percent by mass of the finished polymer. The residues of the following may be present.

3.6.1 Inhibi/ors

4-tert-Butyl catechol ( maximum 0.00 1 percent )

3.6.2 Process Antioxidants

a) Tri-( nonylphenyl ) phosphite;

8

IS : 10149 - 1982.

b) Di-tert-butyl-p-cresol; and

c) 2, 2’-Methylene-bis-( 4 methyl-6-tert-butyl phenol ).

3.6.3 Chain Transfer Agents

a) Terpinolene,

b) Alpha-methyl styrene dimer, and

c) Alkyl mercaptans.

3.7 Other Ingredients

3.7.1 Polymerization Ingredients - Other polymerization ingredients may be present provided that the manufacturer has obtained specific approval for their use from the concerned statutory authority and used within any limitation imposed by such authority.

3.8 Auxiliary Items for Working - These include the following lubricants, antioxidants and other additives:

a) Lubricants:

1)

2)

3)

4)

5)

6)

7)

8)

9)

10)

Aliphatic fatty acids, saturated or unsaturated, higher than C,;

Amides of aliphatic fatty acids, saturated or unsaturated, higher than C, ( maximum 0.3 percent );

Aliphatic fatty alcohols higher than Cs;

N, N’-Bis-stcaryl ( and/or palmityl ) ethylene diamine ( maximum 2 percent );

Microcrystalline waxes, paraffins or paraffin oil, containing less than 0.1 ppm of noxious polycyclic aromatic hydro- carbons;

Natural waxes ( carnauba wax, beeswax, japan wax );

Esters of montanic acid with ethane dihydric alcohol and 1, 3-butane dihydric alcohol;

Esters of diethylene glycol with a olcic, palmitic, ricmoleic and stearic acids;

Esters of glycol with fatty aliphatic acids, saturated or not, higher than C,;

Esters of fatty aliphatic acids, saturated or not, higher than C, with alcohol from C, to C,;

9

IS:10149 - 1982

11)

12)

13)

14)

15)

16)

17)

18)

19)

20)

21)

Esters of sorbitol and/or sorbitan with fatty aliphatic acids, saturated or not, higher than C,;

Oils and fats of bones, refined with a maximum of 1 percent non-saponifiable matter;

Vegetable oils, edible grade;

Octoate, oleate, palmitate and stearate of zinc ( maximum 2 Percent on the whole of these products );

Organ0 polysiloxanes with methyl and/or phenol groups ( silicon oil ) the viscosity of which at 20°C is at least 100 centipoises;

Polyethylene glycol of molecular mass at least 300 and the monoethylene glycol content of which is less than 0.1 percent;

Poly ( 1, 2-propylene glycol ) of molecular mass greater than 300 and the 1, S-propylene glycol content of which is less than O* I percent;

Polyoxyethylene (20) monooleate of sorbitan;

Salts of calcium, sodium, aluminium, magnesium, lithium, ammonium ( NH, ) and aliphatic fatty acids, saturated or not, higher than C,;

Salts of calcium, sodium, potassium and magnesium of phosphoric acids;

2-Hydroxyethyl-ester of amides of aliphatic fatty acids, saturated or not, C, and above;

22) Morpholine and its salts of fatty aliphatic acids, saturated or not, superior to C,;

23) Phthalates of manovalent alcohols C, to Cr, (maximum 2 percent );

24) Ketones obtained from aliphatic acids C, to Crz or from stearic acids; and

25) DibutyI dithiocarbamate of zinc

b) Antioxidants:

1) 2)

3)

Thiodipropionic acid;

Dicetyl thiotlipropionate;

Dilauryl thiodipropionate or distearyl thiodipropionate;

10

IS : 10149 - 1982

4) 2, P’-Dihydroxy-3, 3’-di ( a-methylcyclohexyl 5, 5’ dimethyl diphenyl ) methane;

5) 2, 6-tert-But+4-methylphenol;

6) 2 and/or 3 tert-butyl-4-hydroxyanisol;

7) 4,4’-Butylidene-bis-(6-fert-butyl-m-cresol );

8) Gallates-dodecyl, octyl and propyl;

9) 2, P’-Methylene-bis-( 4-ethyl-6-tert-butyl phenol );

10) 2, 2’-Methylene-bis-(4-methyl-6-terf-butyl phenol );

11) 4, 4’-Methylene-bis-( 2-6-di-tert-butyl phenol );

12) 2,6-Di-tcrt-butyl-4-methoxy methylphenol;

13) n-Octadecyl-( 4’-hydroxy-3’, 5’-di-tcrt-butyl phenyl ) pro- pionate;

14) 2-n-Octyl-thio-4, 6-di-( 4’-hydroxy-3’, 5’-di-tert-butyl ) phenoxy triazine;

15) Thio-bis-di-see-amyl phenol;

16) Thio-bis-( 2-methyl-5-tert-butyl phenol );

17) 4,4’-Thio-bis-( 6-tert-butyl-3-methyl phenol );

18) 2,4,5,-Trihydroxy butyrophenone;

19) 1, 3, 5,-Trimethyl-2-4-6-tris-( 3-5-di-tcrt-butyl-4 hydroxy- benzyl ) benzene;

c 20) 1, 1, 3-Tris-( 2-methyl-4-hydroxy-5-tert-butylphenyl ) butane;

21) 2-4-Dinonylphenyl-di-(4-mono-nonylphenyl ) phosphite, with a maximum 20 percent content of di-iso-octyl-nonyl-phenyl phosphite and products of oxidation;

22) Phenol and/or cresols condensed with styrene and/or l’-l’- methylstyrene and,‘or olefins ( C, to C,, ); and

23) Octadecyl-3 ( 3,5-di-tert-butyl-4-hydroxyphenyl ) propionate. NOTE - Whatever be the number of antioxidants used, the total content

of antioxidants is limited to 1.5 percent maximum.

c) Other additives:

1) Barium sulphate, without soluble barium;

2) Aluminium sulphate;

11

IS : 10149 - 1982

3)

4)

5)

6)

7)

8)

9)

10)

11)

12)

13)

14)

15)

16)

17)

Calcium, sodium, potassium and magnesium chlorides;

Calcium carbonate;

Aluminium and magnesium sulphates;

Sodium sulphate;

Sodium phosphate, ortho and pyrophosphate of calcium and sodium and the corresponding salts of potassium and magnesium;

Citric, tartaric, acetic and phosphoric acids;

Sodium and magnesium formates;

Zinc oxide;

Zinc sulphide;

2-ethylhexoate of zinc;

Aliphatic alcohols C, to C&,;

Carboxymethyl cellulose; ’

Methyl cellulose;

Hydroxyethyl cellulose; and

Methyl hydroxypropyl cellulose.

NOTE - The total zinc content in the material shall be less than 1 percent.

12

Is:10149 - 1982

( Continued from page 2 )

Plastics in Food Packaging and Allied Industries Subcommittee, PCDC 12: 12

Convener

SHRI D. S. CHADHA

Representing

Central Committee for Food Standards ( Director- ate General of Health Services ), New Delhi

Members

SERI B. ANANDASWAMY

DR P. K. BANERJEE

Central Food Technological Research Institute ( CSIR ) , Mysore

Polvolefins Industries Ltd, Bombay . SHRI V. DORAIRAJ ( Alternate )

SERI S. T. BHOJWANI ’ ’ - Bright Brothers Ltd, Bombay SHRI A. H. KHAN ( Altcrnatc )

SHRI T. S. RIDDAPA National Organic Chemicals Industries Ltd, Bombay _

SHRI J. K. VADODARIA (Alternate ) SRRI P. V. DATAR Polychem Ltd, Bombay

SHRI C. U. KHANDHERIA ( Alternate ) DR S. S. GOTHOSKAR Drugs Controller ( India ), New Delhi

SHRI D. S. CHADHA ( Alternate ) SHHI D. JAIN The Alkali & Chemicals Corporation of India

Ltd, Calcutta SHRI S. K. JAIN Hoechst Dyes & Chemicals Ltd, Bombay

SHRI K. A. T. VARCHESE ( Alternate ) SHRI R. KALIDAS Chemicals & Plastics ( India ) Ltd, Madras

SRRI S. S. GATTANI ( Alternuts ) SHRI K. R. NARASIMHAN Metal Box India Ltd, Calcutta

DR S. LAESHMANAN ( Altrrnatc ) SHRI P. V. NARAYANAN Indian Institute of Packaging, Bombay

SHRI G. S. PURU~~HOTHAMAN ( Alternate ) DR N. P. RAO Defence Institute of Food Preservation & Storage,

New Delhi SHRI V. K. MATEUR ( Alternate )

REPRESENTATIVE Bhabha Atomic Research Centre, Bombay DR B. R. ROY Central Food Laboratory, Calcutta SERI K. C. SAH Union Carbide India Ltd, Calcutta

SRRI V. NIJHAWAN ( Altmatc ) DR N. SEN Hindustan Lever Ltd, Bombay DR P. R. SESHAN Indian Petrochemicals Corporation Ltd, Vadodara

SHRI A. K. RAY ( AIternatc ) SHRI P. P. SHARMA Directorate General of Technical Development,

New Delhi SHRI N. K. AQARWAL ( Alternate )

SHRI L. SHETH Bakelite Hylam Ltd, Hyderabad SHRI G. K. SRINIVASAN ( Alternate )

SHRI 0. P. SRIVASTAVA Defence Food Research Laboratory, Mysore SHRI A. N. SRIVASTAVA ( Altmntr )

AMENDMENT NO. 1 FEBRUARY 2000 TO

iS 10149 : 1982 POSITIVE LIST OF CONSTITUENTS OF STYRENE POLYMERS IN CONTACT WLTH

FOODSTUFFS, PHARMACEUTICALS AND DRINKING WATER

(Coverpages 1 and 3, Title ) -Substitute the following for the existing:

‘POSITIVE LIST OF CONSTITUENTS OF POLYSTY-RENE (CRYSTAL AND HIGH IMPACT) IN

“ZO NTACT WITII FOODSTUFFS, PHARMACEUTICALS AND DRINKING WATER’

(Page 5, Scope, line 1 ) - Substitute ‘polystyrene (crystal and high impact) maleriaI’/or ‘styrene polymers’.

(Pages 5 and 6, clause 2.1 ) -Substitute the following for the-existing:

‘For the purpose of this standard, the definitions of polystyrene materials shall mean:

a) Homo polymers of styrcne produced by the polymerization of styrene;

b) Rubber modified polystyrene consisting of basic polymers produced by combining styrcne-butadiene copolymers and/or poly-buladiene with polystyrene either during or after polymerization of the polystyrene, such that the finished basic polymers contain not less than 75 percent by mass of total polymer units derived from styrene monomer.

c) Mixtures of lhc products listed in (a) and (b) above.’

( Pflge 6, clnirse 3.1, fitle 1 )- Substitute ‘polystyrene materials’ [or ‘slyrene polymers’.

(Page 6, ckse 3.2, line 2 ) - Substitute ‘0.1' for ‘0.2’.

(PCD12)

Reprography Unit, BIS, New Delhi, lndia